[R] substituting values

[TEMPL Matthias]

One way:

A <- matrix(round(rnorm(20)), ncol=4)
A[2,1] <- "x"
A[which(A == "x", arr.ind=TRUE)] <- NA
A <- matrix(as.numeric(A), ncol=dim(A)[2])

Best,
Matthias


> -----Ursprüngliche Nachricht-----
> Von: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] Im Auftrag von 
> Stefan Semmeling
> Gesendet: Donnerstag, 09. März 2006 14:32
> An: r-help at stat.math.ethz.ch
> Betreff: [R] substituting values
> Vertraulichkeit: Persönlich
> 
> 
> dear list,
>  
> i have a matrix with missing values like
>  
> 1    2    3    4    x
> x    2    2    2    2
> 2    2    2    x    2
>  
> the x stands for the missing value.
> i have to substitute it to NA
>  
> substitute or replace didn´t work out, as they are for vectors only
>  
> however matrix[,i] also didn´t work.
>  
> can anybody tell me, who i can change these values easily?
>  
> thanks stefan
> 
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> 
>